Dust-collector.



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ROGER DANVIN, OF PARIS, FRANCE.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 658,832, dated October 2, 1900.

Application led March 13, 1899. Serial No. 708,791. (No model.)

T0 all whom it 11n/ty aon/cern:

Be it known that I, 'ROGER DANvIN, a citizen of the Republic of France, residing in Paris, France, have invented a new and useful Improvementin Dust-Collectors, of which the following is a specification.

My invention relates to that class of dustcollectors having a separating-chamber composed of a cylindrical portion above and a conical portion below. In such devices as usually constructed the dust-laden air enters the chamber through an opening which is tangential to the cylindrical part, and it es capes through the perforated top or cover of the chamber, while the separated dust is removed through an opening at the bottom of the conical portion. single or double, is placed in the chamber, the iiue being oblong and closed at its bottom, except where occasional perforations or doors are introduced to remove the 'accumulated dust, the tangential inlet, as well as the air-outlet through the top of the chamber, being preserved. In another form a spiral conduit supplied with delecting-plates is placed in the chamber; but the air-inlet is central a-nd at the top, while the outlet is on one side of said chamber. l

My improvement consists in introducing in the separating-chamber a single imperferate spiral conduit, the convolutions of which are entirely open at the bottom. This conduit is placed in the annular space comprised between the outer cylindrical wall of the chamber and a central sleeve through which the clean air escapes. It begins at an opening tangent to the cylindrical wall andv divides the annular space into a certain number of convolutions, which depends upon the volume of air introduced and also upon the degree of efficiency required from the dustcollector.

In the accompanying drawings, forming part of this speciiication, Figure 1 is a vertical section of my apparatus. Fig. 2 is a horizontal section at X Y of Figs. 1 and 3. Fig. A3 shows another form of spirals.

As shown in the drawings, there is a cylindrical part A above a conical part B. An internal sleeve D, open at both ends, is riveted to the top or cover C of the chamber, so as to allow the clean air to escape. A spiral Sometimes a spiral lue,

conduit G G G is riveted to the cover. It is open at the bottom and begins at an inlet F tangential to the wall of the chamber A. The convolutions stop at or near the point S. The dust-outlet is at E.

In the form as shown on Fig. l the lower edge of the open spiral conduit ends at or near the junction-line of the cylinder and the cone. In the form as shown on Fig. 3 the lower ends of the spirals are carried below this junction-line, each successive convolution reaching lower than the preceding one, though never low enough to touch the wall of the conical part, and in such a manner as to leave an open space L, through which the dust may be discharged, care being taken that the open spaces L be always of uniform section or, in other words, that in the circular portions the lower edge will be horizontal, following a plan perpendicular to the vertical axis of the apparatus, while in the portions which connect an upper convolution to alower one as, for instance, between points aand b and points @and d-the curve of the loweredge will be such as to preserve the opening L uniform throughout with regard to the surface of the cone. The space between' the last or inner spiral and the sleeve D should be substantially equal to the space between eacn of the outer spirals.

The operation of my device is similar in principle to that of all dust-collectors of the same class; but my proposed improvement by maintaining the centrifugal action necessary for separation in an unobstructed manner allows, with an apparatus of much smaller dimensions than usually employed, the thorough cleaning of the air and the precipitation of even the lightest materials, such as iour and similar substances. It also greatly simplies the construction, while it insures greater efficiency.

I do net claim any of the combinations alluded to in the foregoing speciiicat-ion; but

I claim as my inventionl. In a dust-collector, the combination of a separating-chamber having a cylindrical upper portion and a conical lower portion and having an air-outlet at the top and a dustoutlet at the bottom, with a single spiral conduit entirely detached from the central exitsleeve, D, placed in the upper portion of the separating-chamber, said spiral conduit having an inlet substantially tangential tol the cylindrical portion of said chamber and the walls of which are free from perforations or deliecting devices of any kind, the convolutions as well as the space between the last spiral and the central exit-sleeve beingl open at the bottom for the free discharge of air and dust, substantially as shown and specified.

2. In a dust-collector, the combination of a separating-chamber having a cylindrical upn per portion and a conical lower portion and having an air-outlet at the. top and a dustontlet at the bottom, Wit-hpa single spiral con,-

duit entirely disconnected from the central exit-sleeve, D, placed in the upper portion of the separating-chamber, said spiral conduit l messes.

ROGER DANVIN.

Witnesses:

LOUIS SULLIGER,

EDWARD. P. M'AoLEAN. 

